Eratosthenes gives the distances as follows: From Mt. Caspius to the Cyrus River, about one thousand eight hundred stadia; thence to the Caspian Gates, five thousand six hundred; then to Alexandreia in the country of the Arians, six thousand four hundred; then to the city Bactra, also called Zariaspa, three thousand eight hundred and seventy; then to the Iaxartes River, to which Alexander came, about five thousand; a distance all told of twenty-two thousand six hundred and seventy stadia. He gives also the distance from the Caspian Gates to India as follows: To Hecatompylus, one thousand nine hundred and sixty stadia; to Alexandreia in the country of the Arians, four thousand five hundred and thirty; then to Prophthasia in Drangge, one thousand six hundred (others say one thousand five hundred); then to the city Arachoti, four thousand one hundred and twenty; then to Ortospana, to the junction of the three roads leading from Bactra, two thousand; then to the borders of India, one thousand; a distance all told of fifteen thousand three hundred stadia.1
We must conceive of the length of India, reckoned from the Indus River to the eastern sea, as continuous with this distance in a straight line. So much for the Sacae.